IS YOUR QUESTION ANSWERED HERE?

Why can't I find my account? Why can't I login?

It's possible your account was deleted. Try searching for your
username / membername on the General Search page.
If you are taken to a profile within your account, then your account has not been deleted.
If you are not taken to a profile within your account, but instead, you see a 'There is no such user' message,
or you are returned to the Search page, then your account has been deleted.